Tube chamfering tool



May 17, 1949- R. M. GASSMANN 2,470,392.

TUBE CHAMFERING TOOL Filed Oob. 25, 1945 4, 2 I 1/ vento:-

Patented May 17, 1949 UNITED STATES PATENT' TUBE CHAMFERINGY TGOLv Raymond M. Gassmann, Wilmette,.Ill.-, assignerof one-fourth to Bernard M. Kollath,y Roy- Maier, and Albert P. Stein, Chicago', Ill;

Application October 25, 1945, SeralNo'.' 624,449'

(Cl. 'T7-73) 3 Claims. 1i

My present invention relates to mechanics accessories and has `for-its object to provide a tool by means of which a tube may be chamfered on both inner and outer edges at one and the same time.

Another object of this invention is to provide a tool for forming. a double charnfer in a single operation.

Another object of the device is to provide a reamer in which a desired number of cutter blades may be held according to the job to be performed or the material to be. worked upon.

A still further object of the invention is to provide a double chamferingp hand tool, which may also be used as a machine accessory.

Another object of vmy invention is to provide a cutting tool the blades of which are located out of contact with: the Vhand of the operator thereof, thereby providing a safety first tool.

Other features and advantages will become more readily apparent from the following description and the accompanying illustrative drawings in which.:

Figure 1 is an elevational view of my tool,

Figure 2 is a vertical sectional view thereof,

Figure 3 is a plan view'of the device,

Figure 4 is a perspective view of a blade holder, and

Figure 5 is a detail similar view of a reamer blade.

In the above drawings as well as in the speciiication to follow, the same characters of reference indicate the same parts throughout.

While one embodiment of my invention is illustrated in the above referred to drawings, it is to be understood that they are merely for the purpose of illustration and that various changes in construction may be resorted to in the course of manufacture in order that the invention may be utilized to the best advantage according to circumstances which may arise, without in any way departing from the spirit and intention of my device, which is to be limited only in accordance with the appended claims. And while I have stated the primary eld of utility of my invention it remains obvious that it may be employed in any other capacity wherein it may be found applicable.

In the drawings, IIJ indicates my tool which consists of a holder I I, which consists of a shank I2, having a rectangular free terminal I3, for engagement with any device by which it may be rotated for machine application. However the device is intended primarily as a hand tool to be used on the job, such, for instance, as connecting up refrigerators or other home appliances and electric 2., devices. The shank;- I2 is provided with an enlarged plate I4, frornsthe` central portion I5', of which projects 'a'.series-ot' spacedv segmentsl I5, through the center of, whicnlis a relatively. large bore I6, for a purpose presently to--be stated. Projecting annularly fromthe .outer surfaces yI l, of theelements I5,isla-ange I3. All of the aforesaid elementsare formed. in one single unit.

The slots I9, between-they said segments. I5, are provided for receiyinga series of reamingzmembers 2, each .having a V-sh'aped recess 2l, in its upper edge 22;Y whichvrecess is provided with opposing inclined 'convergingblades 23v and 24. TheA lower end-25,7 .oflthe cutter has projecting from its edge 2li,` a. toe 21," which has double function of a guide into `the slcts` I9,` and a seat for the lower end '2810i a tubular blade retainer thimble 29. Thpilot head' 30,'ofmember 29,' provides arr annular shoulder 3i, adaptedto seat upon all of the inner terminals' 32,1 of the cutters 2U, when the cutters are 'pla'cedand the .thinible 29, is seated in the saidbore I6. It' is to be noted that the blades cannot be incorrectly seated in their slots, to bring .the cutting `edges 33, ininoperative position,v due tothefact that 'if a blade should be .reversed so as 'td 'bring its outer 'ed'ge 34; toward the 'thimble '29,' 'the' V'terniinal of the cutter would stop the thimble from entering its seat I6 or prevent the proper application of the ring 3B.

The purpose of the flange I8, is to receive a retainer ring 36, adapted to be placed thereon after the cutters have been inserted in their several slots I9. This ringl 36, is of a size to be held seated in place by frictional engagement with the surfaces II, of the segments I5, and the edges 311, of the cutters, both of which are engaged by the inner surface 3l, of the ring.

The thimble 29, is internally threaded to receive a screw 38, the end 39, of which is threaded into a bore 40, threaded through the center of the plate I4, and the shank I2. The head iii, of the screw 38, is countersunk in the countersink d2, of the head 30, of the thimble and is provided with a driver slot 53, and said screw 38, securely holds all of the elements of the tool in locked relative position.

The V-recesses 2l, in the blades '20, are arranged for chamfering the edges of a tube of a particular diameter, and the head 3G, of the thimble is of a diameter to snugly iit into that particular tube to form a guide for seating the device upon the tube and grinding the cutting edges upon the inner and outer surfaces of the edge 44, of a tube 45. The device is of a size to conveniently t into the hand of a user. The shank end I3, is adapted to seat in a socket member 46, having asliding crank handle 41, when the tool is to be used on a tube of hard material.

It will be obvious that a diierent set of cutters and a different thimble will be provided for tubes of various sizes. The cutters are provided with bores 48, in `order to keep various sizes on different rings or wires. The device is adapted for scraping the burrs from newly cut piping as well as for chamfering the same. A half-turn of the tool will completely clean the pipe end of burrs.

It is thought that persons skilled in the art to which the invention relates will be able to obtain a clear understanding of the invention after considering the desciption in connection with the drawings. Therefore, a more lengthy description is regarded as unnecessary.

Changes in shape, size and rearrangement of details and parts such as come within the pur- View of the invention claimed may be resorted to, in actual practice, if desired.

Having now described my invention, that which I claim as new and desire to procure by Letters Patent is:

1. A chamfering tool comprising a shank portion, an enlarged annular table and a radially slotted boss of a diameter less than said table, a center bore extending through said boss, a plurality of similar generally rectangular blades V-notched at the outer ends thereof and having inwardly disposed toes on the inner ends thereof which latter ends seat n said table, a combined pilot post and thimble insertable in said bore and dimensionally and positionally adapted to guide work onto the tool and to space said blades apart and to engage said toes, and a ring adapted to seat upon said table and to frictionally engage outer edges of said blades to hold said blades against said thimble, said toes preventing accidental insertion of the blades in reversed position.

2. A chamfering tool comprising a shank portion, an enlarged annular table and a radially slotted boss of a diameter less than said table, a center bore extending through said boss, a

plurality of similar generally rectangular blades V-notched at the outer ends thereof and having inwardly disposed toes on the inner ends thereof which latter ends seat on said table, a combined pilot post and thimble insertable in said bore and dimensionally and positionally adapted to guide Work onto the tool and to space said blades apart and to engage said toes, and a ring adapted to seat upon said table and t0 frictionally engage outer edges of said blades to hold said blades against said thimble, said toes preventing accidental insertion of the blades in reversed position, said thimble, table and shank being centrally bored and threaded, and a threaded screw having a head adapted to hold said thimble in tight engagement with said blades.

3. A chamfering tool comprising a shank portion, an enlarged annular table and a radially slotted boss of a diameter less than said table, a center bore extending through said boss, a plurality of similar generally rectangular blades Vnotched at the outer ends thereof and having inwardly disposed toes on the inner ends thereof which latter ends seat on said table, a thimble insertable in said bore and adapted to space said blades apart and to engage said toes, and a ring adapted to seat upon said table and to frictionally engage outer edges of said blades to hold said blades against said thimble, said toes preventing aocidental insertion of the blades in reversed position, said thimble having a head adapted to engage the inner portions of the upper ends of said blades and also being dimensionally adapted as a pilot post to guide work into the V-notches on the said upper ends.

RAYMOND M. GASSMANN.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,499,416 Stech July 1, 1924 1,563,260 Grammy Nov. 24, 1925 2,188,584 Tyne Jan. 30, 1940 

